Aquatic Invasive Plant Control Projects - Lake Tahoe - 2019-2021 - Tahoe Resource Conservation District [ds2925]

This dataset was compiled by Tahoe RCD to record the status of aquatic invasive plant control sites and document control work implemented at these sites. It includes data obtained from Tahoe RCD, TRPA, USFS, CTC, and California State Parks. This dataset is used to allocate resources and plan aquatic invasive plant control work in the Lake Tahoe Basin Region.

<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This shapefile contains records for aquatic invasive plant control projects in the Lake Tahoe Basin Region. This dataset does not include historic infestation sites. Points are generalized and in some cases multiple small, discrete populations may be grouped as a single control site for planning logistics. Data should be interpreted with this in mind. Attributes are listed for aquatic invasive plant species detected at each location, and management status (infest_sta) and control methods (contr) implemented in 2018, 2019, 2020, 2021, 2022, 2023, &amp; 2024. Confirmation of species and status was obtained by contracted dive teams during field visits. Development of status categories is ongoing and subject to change in future updates to this dataset. </SPAN></P><P><SPAN>Abbreviation Definitions: </SPAN></P><P><SPAN>EWM = Eurasian watermilfoil. </SPAN></P><P><SPAN>CLP = curly-leaf pondweed. </SPAN></P><P><SPAN>NZM = New Zealand mudsnail. </SPAN></P><P><SPAN>InvPlantSp = Aquatic Invasive Plant Species. </SPAN></P><P><SPAN>Contr = This attribute describes the Control Methods that were implemented each year. For example, Contr_2024 describes control methods implemented in 2024. </SPAN></P><P><SPAN>DAS = diver assisted suction. </SPAN></P><P><SPAN>SM or surveillance = surveillance monitoring. </SPAN></P><P><SPAN>SA = site assessment. </SPAN></P><P><SPAN>MMP SA = Marina Management Plant Site Assessment (different boundary). </SPAN></P><P><SPAN>SA w NZM = Site Assessment with addition of divers tasked with detecting NZM in survey boundary with a focus on future treatment areas. </SPAN></P><P><SPAN>Infest_Sta = This attribute describes the management status of the infestation site by year. For example, "Infest_Sta_2024" describes the infestation status assigned at the end of 2024. This status incorporates current treatment needed, diver effort, and current funding to prioritize planning efforts and future funding. This status does not indicate the amount of plants, level of establishment, or threat level of an infestation. </SPAN></P><P><SPAN>P1- Planning 1: "Passive" Known or possible infestation. Information regarding the location may be insufficient, access to the site may be blocked, or a funding strategy for future treatment has not yet been established. If there is a funding lapse in a control or surveillance project, those sites will be changed to this category until the funding plan is resolved. </SPAN></P><P><SPAN>P2 - Planning 2: "Active" Known infestation. Active planning and/or procurement of funds are being actively implemented. Site Assessments, coordination with land owners, Containment, marina-led maintenance treatment, or pilot methods testing projects may be being implemented. Active control methods (barriers, diver-assisted suction, UV-C, or dredging) will likely be needed to treat this site. </SPAN></P><P><SPAN>C1 - Infestation Active Control 1: Known infestation. Active control methods (barriers, diver-assisted suction) were implemented over the course of the season. </SPAN></P><P><SPAN>C2 - Infestation Hand Removal 2: First time or previously treated control site that only required hand removal to remain weed-free. Over the course of one season, surveillance visits utilizing hand removal may require substantial effort (20 diver hours) beyond the baseline expected surveillance effort. EDRR sites that are discovered and treated with only hand removal during the season will remain in this category until they are accommodated for in the Surveillance Monitoring plan. </SPAN></P><P><SPAN>S1 - Surveillance Higher Risk 1: Previously treated control site. Over the course of one season, no more than 20 divers hours over the expected surveillance effort was required at this site to maintain weed free status. </SPAN></P><P><SPAN>S2 - Surveillance Lower Risk 2: Historic infestation site. AIP have been treated and/or detected in this location. Consecutive surveys over the course of at least three years have shown no detections of rooted AIP. </SPAN></P></DIV></DIV></DIV>

Sara Matthews, Tahoe Resource Conservation District (Tahoe RCD)